ASER is defined as the averaging of conditional symbol error rate (SER) \(P_{e|\gamma }(\cdot )\) 
over the PDF \(f_{\gamma }(\cdot )\)  of SNR \(\gamma \)  [1]}, i.e.,
\(P_{e}= \mathbb {E}\left[ P_{e|\gamma }(x)\right]=\int _{0}^{\infty } P_{e|\gamma }(x)f_{\gamma }(x)dx.\) 
